Does the winter mixture of gas lose efficiency?

[johnnyapollo]

22 gallon tank - I also air my tires up to 46 pounds as a normal pressure. Tend to get about one additional mile per gallon out of it at that pressure, but it does make the ride much rougher and noisier. I've got V-rated radials - I'm not sure if I'd recommend too much air on tires with thinner sidewalls.

-- John

[DarkWing]

Yeah, I think the book has it as 22.5, though, I tend to fill the neck up to the top, but not pouring out on the cladding.
Since out temps have been kind of nuts here, teen's at night, 50's during the day, I do try to switch to non-ac-assisted modes of environmental control asap, but sometimes it stays on all the way to work. Thought about trying another route to work, hiway but longer, but too much on my plate to play with the numbers right now.
D.W.
#0147

[So-CalVX]

22.5 gallon tank